APPARATUS AND METHOD FOR COMMUNICATING PACKET DATA CONTROL CHANNEL IN A MOBILE COMMUNICATION SYSTEM
A base station transmission apparatus for transmitting MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive transmission packet data and length information of the transmission packet data in a mobile communication system for high-speed packet transmission, having an encoder for encoding a bit stream indicating the MAC ID information and generating coded symbols; a Walsh cover section for Walsh-covering the coded symbols from the encoder with a Walsh code based on the length information; and a Walsh spreader for spreading the Walsh-covered symbols from the Walsh cover section with a predetermined Walsh code.
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This application is a divisional of application Ser. No. 10/096,153, filed on Mar. 11, 2002, which claims priority to an application entitled “Apparatus and Method for Communicating Preamble Channel in a Mobile Communication System” filed in the Korean Industrial Property Office on Mar. 10, 2001 and assigned Serial No. 2001-12475, an application entitled “Apparatus and Method for Exchanging Packet Data Channel in a Mobile Communication System for High-Speed Packet Transmission” filed in the Korean Industrial Property Office on Mar. 19, 2001 and assigned Serial No. 2001-14161, and an application entitled “Apparatus and Method for Exchanging Packet Data Channel in a Mobile Communication System for High-Speed Packet Transmission” filed in the Korean Industrial Property Office on Apr. 11, 2001 and assigned Serial No. 2001-19373, the contents of all of which are hereby incorporated by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates generally to a mobile communication system for high-speed packet transmission, and in particular, to an apparatus and method for communicating control information needed for demodulation of a packet data transmission channel.
2. Description of the Related Art
In general, a mobile communication system for high-speed packet transmission is divided into two systems, one system supporting only data transmission and another system supporting voice transmission as well as data transmission. The mobile communication system for high-speed packet transmission is designed to use a high-speed packet data transmission channel for a high-speed data service. The high-speed packet data transmission channel (e.g., a packet data channel (PDCH) of 1xEVDO and 1xEVDV) is shared by a plurality of users on a time division multiplexing (TDM) basis in order to transmit data at high speed.
In the mobile communication system for high-speed packet transmission, a transmitter transmits control information, to control the transmission of data. The data is transmitted through the high-speed packet data transmission channel on a TDM basis, over a packet data control channel (PDCCH), also known as a preamble channel. To provide a data service through the high-speed packet data transmission channel, a mobile terminal must receive control information for the data containing information pertaining to a destination, a data length, a data rate and a modulation mode, among others, of the data transmitted at a specific point in time.
The control information for the packet data includes subpacket length information, MAC (Medium Access Control) ID, data rate, modulation mode, payload size, subpacket ID (SPID), and ARQ (Automatic Repeat Request) channel ID. As mentioned above, in the mobile communication system for high-speed packet transmission, a transmission unit of the data transmitted through the high-speed packet data transmission channel is called a “subpacket”, and the “subpacket length information” refers to the time required to transmit the data over the high-speed packet data transmission channel on a TDM basis. A system supporting a variable data length must transmit this information to the mobile terminals. The MAC ID, an identifier for mobile terminal identification, is assigned to the mobile terminal desiring to receive a high-speed packet data service during system access. The “data rate” is a transfer rate of data having the subpacket length, and the “modulation mode” indicates a selected one of QPSK (Quadrature Phase Shi Keying), 8PSK (8-ary Phase Shift Keying), 16QAM (16-ary Quadrature Amplitude Modulation) and 64QAM (64-ary QAM) modulations used to modulate the transmission data. The “payload size” refers to the number of information bits constituting one subpacket, and the subpacket ID (SPID), an identifier of each of the subpackets, is used to support retransmission. The ARQ channel ID, an identifier for supporting continuous data transmission to one mobile terminal, is used in identifying a parallel transmission channel.
As described above, in the mobile communication system for high-speed packet transmission, the control information transmitted over the packet data control channel includes 2-bit subpacket length information, 16-bit MAC ID, 2-bit payload size, 2-bit SPID and 2-bit ARQ channel ID, and the data rate and the modulation mode are determined depending on the 2-bit subpacket, the 2-bit payload size and Walsh function information used for packet data transmitted over a packet data transmission channel transmitted through another channel. Thus, upon receiving packet data after being assigned MAC ID during system access, a mobile terminal (or user) desiring to be provided with the high-speed packet data service demodulates the received packet data control channel and analyzes the MAC ID to determine whether the received packet is destined thereto. If so, the terminal demodulates the packet data using information on subpacket length, payload size, SPID and ARQ channel ID, acquired by demodulating the packet data and information on a Walsh function used for packet data channel transmission. Here, information on a data rate and a modulation mode of the received subpacket is determined based on a combination of the subpacket length, the payload size and the Walsh function used for the packet data channel.
For example, the mobile communication system for high-speed packet transmission transmits the packet data control information using two packet data control channels: a forward primary packet data control channel (PPDCCH) and a forward secondary packet data control channel (SPDCCH). Such packet data control channels are utilized along with the packet data channel (PDCH) on a code division multiplexing (CDM) basis. That is, the forward primary packet data control channel, the forward secondary packet data control channel and the packet data channel are assigned different code channels, and the channels are all transmitted on at the same time.
As descried above, since the packet data channel and the packet data control channels are simultaneously transmitted upon, it is very important for a receiver to promptly demodulate data on the two packet data control channels without error. Accordingly, there is a demand for a scheme capable of efficiently transmitting various control information for demodulation of data on the packet data channel.
SUMMARY OF THE INVENTIONIt is, therefore, an object of the present invention to provide an apparatus and method for efficiently transmitting various control information needed for demodulation of a packet data transmission channel data in a mobile communication system for high-speed packet transmission.
It is another object of the present invention to provide an apparatus and method for covering coded symbols for MAC ID (or mobile terminal identification) information with a Walsh cover based on subpacket length information before transmission, in a mobile communication system for high-speed packet transmission.
It is further another object of the present invention to provide an apparatus and method for spreading coded symbols for subpacket length information with a Walsh code based on MAC ID information before transmission, in a mobile communication system for high-speed packet transmission.
To achieve the above and other objects, the present invention provides a base station transmission apparatus for transmitting MAC ID information indicating a mobile terminal to receive transmission packet data and length information of the transmission packet data in a mobile communication system for high-speed packet transmission. The base station transmission apparatus comprises an encoder for encoding a bit stream indicating the MAC ID information and generating coded symbols; a Walsh cover section for Walsh-covering the coded symbols from the encoder with a Walsh code based on the length information; and a Walsh spreader for spreading the Walsh-covered symbols from the Walsh cover section with a predetermined Walsh code.
BRIEF DESCRIPTION OF THE DRAWINGSThe above and other objects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:
A preferred embodiment of the present invention will be described herein below with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
In the following description, the specifics such as a length and a number of the Walsh function used for spreading the forward packet data control channels (or preamble channels), the type of information and the number of information bits transmitted through the packet data control channels are provided by way of example for a better understanding of the present invention. It would be obvious to those skilled in the art that the invention may be implemented without the specifics contained in the examples, through modification thereof.
The term “forward link” as used herein refers to a transmission link from a base station to a terminal (or mobile terminal or mobile station), while the term “reverse link” refers to a transmission link from the terminal to the base station. In addition, the term “slot” as used herein refers to a minimum transmission unit of the forward link, and one slot is 1.25 ms long.
First Embodiment
Referring to
The Walsh code of length 4 used by the Walsh cover section 103 for Walsh covering is determined by subpacket length information. As mentioned above, the subpacket length indicates the number of slots constituting a subpacket. The subpacket length is one of 1 slot, 2 slots, 4 slots and 8 slots. Therefore, when 4 Walsh codes of length 4 are used, it is possible to transmit all of the 4 Walsh codes in the identifiable form. Table 1 below illustrates how subpacket lengths are mapped with Walsh codes used for the Walsh covering. In Table 1, the Walsh codes are mapped by converting binary bits 0 and 1 to +1 and −1.
As illustrated in Table 1, when the subpacket length is 1 slot, the Walsh cover section 103 uses a Walsh code ‘1 1 1’. When the subpacket length is 2 slots, the Walsh cover section 103 uses a Walsh code ‘1-1 1-1’ in Walsh covering the modulated symbols from the QPSK modulator 102. When the subpacket length is 4 slots, the Walsh cover section 103 uses a Walsh code ‘1 1-1-1’. When the subpacket length is 8 slots, the Walsh cover section 103 uses a Walsh code ‘1-1-1 1’. Table 1 shows only one kind of possible mappings between the subpacket lengths and the Walsh codes. There are other possible mappings between the subpacket lengths and the Walsh codes.
Referring to
Referring to
Although
Referring to
The energy measurer 404 and a threshold comparator 405 constitute a device for determining whether the PPDCCH is received or not. The energy measurer 404 measures energy of the despread symbols from the first Walsh despreader 402. An operation of the energy measurer 404 is well known in the art, so a detailed description will be avoided. The threshold comparator 405 compares a measured energy value from the energy measurer 404 with a predetermined threshold, and outputs a packet data control detection signal. As the result of comparison, if the measured energy value is larger than the threshold, the channel compensator 407 is enabled in response to the resultant signal from the threshold comparator 405. This means a case where the PPDCCH is received at high power, thus enabling demodulation of the PPDCCH. Otherwise, if the measured energy value is smaller than the threshold, the channel compensator 407 is disabled in response to the resultant signal from the threshold comparator 405. This means a case where the PPDCCH is not received or received with low reliability, thus disabling demodulation of the PPDCCH. As stated above, the first embodiment of the present invention first determines reception and reliability of the PPDCCH by the energy measurer 404 and the threshold comparator 405, and then demodulates the PPDCCH according to the determined result. In order to minimize a processing time, it is possible to perform the two processes in parallel.
An inverse fast Hadamard transformer (IFHT) 408 performs inverse fast Hadamard transform on the channel compensated signal from the channel compensator 407 in a unit of 4 symbols. The reason for performing the inverse fast Hadamard transform by the IFHT 408 is to search for a Walsh code (or Walsh cover) used by the Walsh cover 103 of
The Walsh decover section 411 decovers the signal from the channel compensator 407 with the Walsh cover from the comparator/selector 410. A QPSK demodulator 412 demodulates a complex signal from the Walsh decover section 411 into a real signal, and outputs demodulated symbols. A decoder 413 decodes the demodulated symbols from the QPSK demodulator 412 and outputs a 6-bit information bit stream corresponding to the MAC ID information. For example, a (12,6) block decoder is used for the decoder 413. Although
Referring to
The energy measurer 504 and a threshold comparator 505 constitute a device for determining whether the PPDCCH is received or not. The energy measurer 504 measures energy of the despread symbols from the first Walsh despreader 502. An operation of the energy measurer 504 is well known in the art, so a detailed description will be avoided. The threshold comparator 505 compares a measured energy value from the energy measurer 504 with a predetermined threshold, and outputs a packet data control channel detection signal. As the result of comparison, if the measured energy value is greater than the threshold, the channel compensator 507 is enabled in response to the resultant signal from the threshold comparator 505. This means a case where the PPDCCH is received at high power, thus enabling demodulation of the PPDCCH. Otherwise, if the measured energy value is less than the threshold, the channel compensator 507 is disabled in response to the resultant signal from the threshold comparator 505. This means a case where the PPDCCH is not received or received with low reliability, thus disabling demodulation of the PPDCCH. As stated above, the first embodiment of the present invention first determines reception and reliability of the PPDCCH by the energy measurer 504 and the threshold comparator 505, and then demodulates the PPDCCH according to the determined result. In order to minimize a processing time, it is possible to perform the two processes in parallel.
A QPSK demodulator 508 QPSK-demodulates the channel compensated signal from the channel compensator 507 and outputs demodulated symbols. An inverse fast Hadamard transformer (IFHT) 509 performs inverse fast Hadamard transform on the demodulated symbols from the QPSK demodulator 508 in a unit of 4 symbols. The reason for performing the inverse fast Hadamard transform by the IFHT 509 is to search for a Walsh code used by the Walsh cover 202 of
The Walsh decover section 512 decovers demodulated symbols from the QPSK demodulator 508 with the Walsh cover from the comparator/selector 511. A decoder 513 decodes the symbols from the Walsh decover 512 and outputs a 6-bit information bit stream corresponding to the MAC ID information. For example, a (12,6) block decoder is used for the decoder 513. Although
Referring to
As described above, in the first embodiment of the present invention, the MAC ID information and the subpacket length information are transmitted over the PPDCCH, while the other control information needed for demodulation is transmitted over the SPDCCH. Here, the subpacket length information is transmitted by Walsh covering.
As illustrated in
After performing the DDPCCH detection, the terminal determines in step 803 whether a measured energy value of the PPDCCH exceeds a predetermined threshold, i.e., whether the PPDCCH is successfully received. If the measured energy value is greater than the threshold, the terminal determines that the PPDCCH is received. Otherwise, the terminal determines that the PPDCCH is not received. If it is determined that the PPDCCH is not received, the terminal returns to step 802 and performs energy detection on the buffered PPDCCH of the next slot. However, if it is determined that the PPDCCH is received, the terminal restores subpacket length information received over the PPDCCH in step 804. The subpacket length information, as described in conjunction with reference to
After restoring the subpacket length information, the terminal restoring the MAC ID information received over the PPDCCH using a Walsh cover of length 4 is calculated through the inverse fast Hadamard transform in step 805. After restoring the MAC ID information, the terminal compares the restored MAC ID information with its own MAC ID information in step 806. If the restored MAC ID information is not identical to its own MAC ID information, the terminal returns to step 801 and performs again energy detection on the buffered PPDCCH of the next slot. Otherwise, if the restored MAC ID information is identical to its own MAC ID information, the terminal recognizes that the received packet data channel is destined therefor, and then proceeds to step 807.
In step 807, the terminal analyzes the subpacket length information to determine whether a length of the subpacket in the packet data channel is 1 slot or 2 slots. If the length of the subpacket in the packet data channel exceeds 2 slots, the terminal additionally buffers the SPDCCH and the PDCH according to the length of the subpacket in step 808. For example, if the subpacket length is 4 and the SPDCCH and the PDCH occupy the same number of slots, the terminal additionally buffers the SPDCCH and the PDCH of the two remaining slots excepting the two slots of the previously buffered SPDCCH and PDCH. As a result, the terminal buffers the SPDCCH and the PDCH of a total of 4 slots.
After additionally performing the SPDCCH and the PDCH, the terminal performs despreading on the buffered SPDCCH and performs sequence combining on the symbols created through the despreading based on the repetition number used by the transmitter, in step 809. Thereafter, in step 810, the terminal restores the remaining control information excepting the MAC ID information and the subpacket length information by decoding the symbols created by the sequence combining. The remaining control information, as stated above, includes the payload size information, the ARQ channel ID information and the subpacket ID information. Thereafter, in step 811, the terminal demodulates and decodes the PDCH using the control information acquired by restoring the PPDCCH and the SPDCCH, thereby restoring the packet data.
If it is determined in step 807 that the length of the subpacket in the packet data channel is 1 slot or 2 slots, the above additional buffering is not performed. Therefore, in step 813, the terminal performs despreading on the buffered SPDCCH of the 1 slot or 2 slots, and performs sequence combining on the symbols created through the despreading based on the repetition number used in the transmitter. Thereafter, in step 814, the terminal restores the remaining control information excepting the MAC ID information and the subpacket length information by decoding the symbols created by the sequence combining. The remaining control information, as stated above, includes the payload size information, the ARQ channel ID information and the subpacket ID information. Thereafter, in step 815, the terminal demodulates and decodes the PDCH using the control information acquired by restoring the PPDCCH and the SPDCCH, thereby restoring the packet data.
Second Embodiment
Table 2 and Table 3 illustrate memory tables required by the base station in assigning the MAC ID to the terminal desiring to receive the data service and managing the MAC ID information. Specifically Table 2 includes using state information indicating whether the MAC IDs are in use at a specific point of time, and also includes information on Walsh functions used for the PPDCCH according to the MAC IDs and information on a transmission channel of the complex channels, to be used for transmission. If the terminal to be provided with the service is determined by a scheduler, a Walsh function to be used for spreading of the PPDCCH is determined according to the MAC ID information of the terminal. After determination of the Walsh function, the base station selects one of the I (In-phase) channel and the Q (Quadrature-phase) channel, to transmit the PPDCCH through the selected channel. Namely, the Walsh function and the transmission channel are assigned to the MAC ID on a one-to-one basis (one-to-one mapping). Even though the same Walsh function is used, the base station can identify the MAC ID using the transmission channel (I or Q channel) information. This means that the base station can identify as many terminals as twice the number of the Walsh functions assigned to the PPDCCH. For example, when 16 Walsh functions are assigned to the PPDCCH, the base station can identify 32 terminals, which means that the base station can assign a total of 32 MAC IDs.
Meanwhile, Table 3 is used when transmitting twice the MAC ID through the PPDCCH and the SPDCCH. As illustrated in Table 3, the same Walsh function and the same transmission channel are mapped to a plurality of MAC IDs (e.g., 2 MAC IDs) (multiple-to-one mapping). Therefore, if the base station transmits the PPDCCH using the Walsh function and transmission channel corresponding to a specific MAC ID, then not only the terminal but also another terminal will demodulate the SPDCCH. In this case, the terminals determine whether the received packet is their own packet or another terminal's packet, by analyzing the MAC ID included in the SPDCCH.
Turning back to
Referring to
If the measured energy value exceeds the threshold, the terminal proceeds to step 1005. Otherwise, the terminal proceeds to step 1017 where it discards the SPDCCH and the PDCH buffered after being received along with the PPDCCH, and then performs energy detection on the buffered PPDCCH of the next slot. Since the base station uses a specific Walsh function uniquely assigned to a corresponding terminal during spreading of the PPDCCH, other terminals except for the corresponding terminal may fail to detect energy in step 1003. If the measured energy value exceeds the threshold in step 1003, the terminal recognizes that the currently received packet data is its own data destined therefor. Thereafter, the terminal demodulates and decodes the PPDCCH in step 1005, and acquires subpacket length information received over the PPDCCH in step 1007.
In step 1009, the terminal determines a transmission length (or sequence repetition number N) of the SPDCCH using the acquired subpacket length information by consulting Table 4. If the transmission length exceeds 2 slots, the terminal additionally buffers the SPDCCH and the PDCH according to the subpacket length. For example, if the subpacket length is 4 and the SPDCCH and the PDCH occupy the same number of slots, the terminal additionally buffers the SPDCCH and the PDCH of the remaining 2 slots except for the two slots of the previously buffered SPDCCH and PDCH. As a result, the terminal buffers the SPDCCH and the PDCH of a total of 4 slots. In step 1009, the terminal despreads the buffered SPDCCH and sequence-combines the symbols created through the despreading based on the sequence repetition number.
Thereafter, the terminal decodes the symbols created by the sequence combining in step 1011, and acquires the remaining control information except for the MAC ID information and the subpacket length information in step 1013. Here, the “remaining control information” may include the subpacket ID information, the payload size information and the ARQ channel ID information. Thereafter, in step 1015, the terminal demodulates the PDCH using the control information acquired by demodulating the PPDCCH and the SPDCCH.
Referring to
Referring to
As described above, the second embodiment of the present invention transmits the MAC ID information and the subpacket length information over the PPDCCH and the remaining control information over the SPDCCH. Here, the coded symbols of the PDCCH are transmitted after being spread with a unique Walsh code based on the MAC ID information.
Third Embodiment
Referring to
If the measured energy value exceeds the threshold, the terminal proceeds to step 1505. Otherwise, the terminal proceeds to step 1519 where it discards the SPDCCH data and the PDCH data buffered after being received along with the PPDCCH, and then performs energy detection on the buffered PPDCCH of the next slot. Since the base station uses a specific Walsh function uniquely assigned to a corresponding user during spreading of the PPDCCH, other terminals assigned no Walsh function may fail to detect energy in step 1503. That is, only the terminals using the same Walsh function will detect the energy in accordance with Table 3. If the measured energy value exceeds the threshold in step 1503, the terminal recognizes that the currently received packet data is its own data. Therefore, the terminal demodulates the PPDCCH in step 1505, and acquires subpacket length information received over the PPDCCH in step 1507.
In step 1509, the terminal determines a transmission length (or sequence repetition number N) of the SPDCCH using the acquired subpacket length information by consulting Table 3. If the transmission length exceeds 2 slots, the terminal additionally buffers the SPDCCH and the PDCH according to the subpacket length. For example, if the subpacket length is 4 and the SPDCCH and the PDCH occupy the same number of slots, the terminal additionally buffers the SPDCCH and the PDCH of the remaining 2 slots except for the two slots of the previously buffered SPDCCH and PDCH. As a result, the terminal buffers the SPDCCH and the PDCH of a total of 4 slots. In step 1509, the terminal despreads the buffered SPDCCH and sequence-combines the symbols created through the despreading based on the sequence repetition number. Thereafter, the terminal decodes the symbols created by the sequence combining in step 1511, and acquires the remaining control information except for the subpacket length information in step 1513. Here, the “remaining control information” may include the MAC ID information, the subpacket ID information, the payload size information and the ARQ channel ID information. Thereafter, in step 1515, the terminal determines whether the MAC ID among the acquired control information is identical to a MAC ID previously assigned from the base station. If the MAC ID is not identical to the previously assigned MAC ID, the terminal discards the buffered PDCCH, SPDCCH and PDCH, judging that the currently received data is not its own data. If, however, the acquired MAC ID is identical to the MAC ID assigned from the base station, the terminal demodulates the PDCH buffered for the subpacket length using the subpacket length information, subpacket ID information, payload size information and ARQ channel ID information, acquired in steps 1507 and 1513, judging that the currently received data is its own data.
Referring to
Referring to
Referring to
As described above, the third embodiment of the present invention transmits the subpacket length information over the PPDCCH and the remaining control information over the SPDCCH. Here, the coded symbols of the PPDCCH are spread with a Walsh function shared by a plurality of terminals, before transmission.
As described above, the mobile communication system for high-speed packet transmission according to the present invention can effectively transmit various control information needed for demodulation of the packet data channel.
While the invention has been shown and described with reference to a certain preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims
1. A terminal reception apparatus for receiving MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive packet data transmitted by a base station and length information of the packet data in a mobile communication system for high-speed packet transmission, comprising:
- a despreader for extracting symbols of a packet data control channel over which the MAC ID information and the length information are transmitted, by despreading a received signal with a Walsh code;
- an energy detector for measuring energy of symbols output from the despreader and generating a packet data control detection signal when the measured energy value is greater than a threshold;
- a length information generator operable in response to the packet data control detection signal, for extracting a Walsh code having a peak value by performing inverse fast Hadamard transform on the symbols from the despreader using a determined Walsh code based on the length information, and generating the length information according to the extracted Walsh code;
- a Walsh decover section for Walsh-decovering the symbols from the despreader with the extracted Walsh code; and
- a decoder for generating the MAC ID information by decoding symbols from the Walsh decover section.
2. The terminal reception apparatus as claimed in claim 1, further comprising a demodulator connected between the Walsh decover section and the decoder, for demodulating the symbols form the Walsh decover section and outputting the demodulated symbols to the decoder.
3. The terminal reception apparatus as claimed in claim 1, further comprising a demodulator connected between the despreader and the length information generator, for demodulating the symbols from the despreader and outputting the demodulated symbols to the length information generator.
4. A terminal reception method in a mobile communication system for high-speed packet transmission, comprising the steps of:
- despreading a signal of a packet data control channel for receiving MAC (Medium Access Control) ID (Identification) information indicating a terminal to receive packet data and receiving length information of the packet data, using a predetermined Walsh code, and generating symbols;
- measuring energy of the generated symbols, and generating a packet data control detection signal when the measured energy value is greater than a threshold;
- extracting a Walsh code having a peak value by performing inverse fast Hadamard transform on the generated symbols using a Walsh code based on the length information in response to the packet data control detection signal, and generating the length information according to the extracted Walsh code;
- Walsh-decovering the generated symbols with the extracted Walsh code; and
- generating the MAC ID information by decoding the Walsh-decovered symbols.
5. The terminal reception method as claimed in claim 4, further comprising the steps of:
- comparing the generated MAC ID information with MAC ID information assigned from a base station;
- acquiring remaining control information by demodulating and decoding a signal of a channel for receiving remaining packet data control information excepting the MAC ID information and the length information, when the generated MAC ID information is identical to MAC ID information assigned from a base station; and
- demodulating and decoding a signal of a channel for receiving the packet data using the length information and the control information.
6. A terminal reception method in a mobile communication system for high-speed packet transmission, comprising the steps of:
- despreading signals received through an I channel and a Q channel with a Walsh code based on previously assigned MAC (Medium Access Control) ID (Identification) information, and generating symbols;
- selecting symbols on the I channel or symbols on the Q channel according to the MAC ID information;
- measuring energy of the selected symbols and generating a packet data control detection signal when the measured energy value is greater than a threshold; and
- generating length information of the packet data by decoding the symbols depending on the packet data control detection signal when the packet data is inputted to the terminal.
7. The terminal reception method as claimed in claim 6, further comprising the steps of:
- after generating the length information, demodulating and decoding a signal of a channel for receiving remaining control information excepting the length information to thereby acquire the remaining packet data control information; and
- demodulating and decoding a signal of a channel for receiving packet data depending on the length information and the packet data control information.
8. The terminal reception method as claimed in claim 7, wherein the control information includes subpacket ID information, ARQ (Automatic Repeat Request) channel ID information and payload size information.
9. The terminal reception method as claimed in claim 6, further comprising the steps of:
- after generating the length information, demodulating and decoding a signal of a channel for receiving remaining packet data control information excepting the length information to thereby acquire the remaining control information;
- acquiring MAC ID information from the control information;
- comparing the acquired MAC ID information with MAC ID information previously assigned from a base station; and
- demodulating and decoding a signal of a channel for receiving packet data depending on the length information and the control information, when the acquired MAC ID information is identical to the previously assigned MAC ID information.
10. The terminal reception method as claimed in claim 9, wherein the control information includes MAC ID information, subpacket ID information, ARQ channel ID information and payload size information.
11. The terminal reception method as claimed in claim 6, wherein the symbols are decoded by block decoding.
Type: Application
Filed: Oct 24, 2007
Publication Date: Feb 21, 2008
Patent Grant number: 7593451
Applicant: SAMSUNG ELECTRONICS CO., LTD. (Suwon-si)
Inventors: Hwan-Joon Kwon (Seoul), Ho-Kyu Choi (Songnam-shi), Young-Kwon Cho (Suwan-shi), Woo-Sang Hong (Seoul), Chang-Hun Bae (Seoul), Youn-Sun Kim (Seoul), Jae-Sung Jang (Kwachon-shi)
Application Number: 11/923,346
International Classification: H04B 7/216 (20060101);